Balancing machine with rocking axis adjustable at will



{Jul 5,192.2 QOHLY I 2,122,621

BALANCING MACHINE WITH ROCKING AXIS ADJUSTABLE AT WILL Filed Jan. 8, 1936 2 Sheets-Sheet l July 5, 193,8. Q'QHLY 2,122,621 BALANCING MACH-INE WITH ROCKINGAXIS ADJUSTABLE AT WILL Filed Jan. 8, 1936 2 Sheets-Sheet 2 Patented July 5, 1938 PATENT OFFICE BALANCING MACHINE wrrn ROCKING AXIS ADJUSTABLE AT wnz.

' Carl Ohiy, Darmatadt, Germany Appllcflfgn January 8, 1936, Serial No. 58,212

Germany January 16, 1935 8 Qlaims. (Cl. 73--51) Balancing machines are known with which the rocking axis, around which the body to be balanced pivots-for'the purpose of the ascertain,=

ment of the errors in balance, may be adjusted to desired positions in relation'to the body balanccd. With the known machines of this de- .scription' the body balanced is mounted on a frame-like or similarly constructed body and the said body restsin bearings which render possible a rocking of the entire device round a rocking axis. The displacement of this rocking axis in relation to the balanced body is effected. either by its beariiigs being displaced along the frame, or by the body which is balanced being itself. displaced or shifted in the frame.

The arrangement described istherefpre not suitable for all cases, because the frame or the body which takes its place either forms an obstruction to the putting on of large bodies for go balancing, especially those which are of an unfavourable shape forthe balancing device, or else the said frame of body must be of extremely largedimensions. In all cases, and especially in the last named, the mass of the frame which I 26 participates in the rocking is relatively large and therefore unfavourably influences the sensitiveness' and the recording accuracy of the machine. On the other hand it is known to provide balancing machines with a pivotally mounted auxiliary rod lying parallel to the weighing body and to displace the rocking axis in relation to the test body.

In accordance with the inventionqthis disadvantage is overcome in the last named balancing machines by arocking axis for the auxiliary rod being displaceably arranged along the auxiliary rod, so that in the case of rocking of the system consisting of test body, connecting rod gear and auxiliary rod, the position of therocking axis of the auxiliary rod compulsorily fixes the position of the rocking axis for the body which is balanced. The auxiliary rod can be arrangedin the known manner over, under, or by the side of the body which is balanced. An advantageous embodiment of the idea of the invention is 5 achieved by the arrangement of the auxiliary rodvertically under the body which is balanced,

so that the load of the body balanced is transe ferred by meansof the link supports to the auxiliaryfrod which is directly connected with the 55 spring supports of the rocking system. .On the auxiliary rod there is conveniently fitted, aswell as the arrangement of the rocking axis, a compensating device which is conveniently .displacepensating device on an auxiliary rod is known with'balancing machines with rocking frames,

therefore without articulated connection between the'auxiliary rod and the body which is balanced. f

In the accompanying drawings, Figure 1 is a perspective viewillustrating an embodiment of the invention.

Figure 2. is a perspective view illustrating an alternative embodiment thereof.

Figure 3 is a front elevation of a further alternative embodiment of the apparatus compris ing theinvention.

Figure 4 is substantially a side elevation from one end of Figure 3 as indicated by the arrows.

Fi ure 5 is an end elevation of a further alternative embodiment of the invention..

Figure 6 is a top plan view of the embodiment illustrated in Figure 5.

-One example of application of the idea 'of theinvention is diagrammatically depicted in Figure 1 of the drawings. .The balancing machine consists of a base a with a rear wall b. 0n the slide c of ,the base is a displaceable saddle bearing d. In the saddle d is a bearing e rotatably mounted on the axis 1 in such a manner that it can pivot on a horizontal axis lying perpendicular to the slide. A tubular rod 9 is mounted in the bearing e so that it is rotatable on the axis of the said bearing. If the saddle d be displaced along the it, while the tubular rod 0 retains its position, the axis of rotation is thus displaced in relation to the tubular rod. Springs i of any desired description, which rest upon the base and upon which the tubular rod 9 supports itself at either end, make the device a system capable of rocking.

On the tubular rod 9 are forkedsliding pieces k and l which are displaceable on the tubular rod and rotatably connected with supporting links m and 1:. These supports are. in turn fork-. shaped at their upper end and in their axes of rotation o and p are mounted the two guide levers q and r. The other end of these two levers is also rotatable, being mounted in sliding members s one of which is not visible in the drawings. These sliding members are displaceable on a 'slide it of the rear wall. .The guide levers q and r slide, for instance by actuation of the handwheel carry rollers u and v, in which the shaft of the body to which is to be balanced is mounted.

The tubular rod. o pivots, as already mentioned, on the axis of rotation f which is dispiacegble along the said tubular, rod. By means of the arrangement of the tubular rod, the supports, and

the body balanced, in the manner of an articulated rectangle, the body which'is balanced does not rotate on the same axis fas the tubular rod'g,

. should lie perpendicular under the body which is but on an axis which lies vertically over the axis 1 and passes through the axis of rotation of the body balanced. By means of this, despite.

the fact that the auxiliary rod 9 can be arranged at any desired distance from the body balanced, the same result is attained as with the mounting of the body balanced directly in e. frame, theaxis of pivoting of which is'actually perpendicular to the axis of rotation of the body which is balanced, as is the case with the known arrangements. It is only necessary for thisv that the supports m. and 11 should be guided parallel tom anci n the tubular rod g acts in the same manner as a guide.

It is not necessary that the auxiiiary rod balanced; it can also be arranged above the said body inthe manner shown in Figures 3 and 4. The supports must in this'ca'se be constituted as pulling members and guided .in a similar manner as in the example depicted. The auxiliary rod can however also be. arranged'at the side of the body which is, balanced as shown in Figures 5 and 6. This arrangement has the advantage that the weight of the body to be balanced is not transferred to the auxiliary rod. ;The body which is balanced is in this case to be mounted in such a manner that it can freely move laterally. If it be rotated, whereby the errors in balance producerocklng, then this rocking is transferred by lateral rod-gears after the manner of the supports, in the example depicted, to the auxiliary rod, the axis of pivoting I of which reust in this case lie vertically. In the same way it naturally follows that the springing oi the auxiliary rod mustbe arranged horizontally as opposed to the vertical arrangement in the example first depicted. In-other, respects the factors in such cases are the sameasdescribed, i. e., balancing body, transmission rod gearand auxiliary rod musiform an articulated rectangle.

The auxiliary rod, which is described in the above mentioned examples as a tubuiar rod, can be censtituted in any other manner desired. For example, a solid rod can be employed. If greater stability is desired, any other kind of section iron can be employed. It is also possible toarrange several such parts above or below one another. The same applies for the rod gear, which-trans fers the movements from the body balanced, to

"the auxiliary rod. This rod gear ean also directly take the mounting for the body which is balanced, in place ofthehorizontai guides.

.For the measurement of the error in balance,

' any of the procedures applicable with the known present invention is, inter alia, specially well suited for measuring processes with the assistance of supplementary centrifugal forces. A suitable device can, .for example, be iii-ted without dimculty on the tubular rod and arranged so that it is displac'eablea It is thus possible to adjust such a device into each desired plane of section of the test body.

The fundamental idea of the invention is to provide a rod which can be made oscillatory by meam of an oscillating axis and which is con nectedto the body to be balanced in such away that thereby is also engendered a-pivotin'g axis for the said body which traverses the latter perpendicularly.

The guiding of the support can also be effected in another manner as shown, in Figure 2. For example, the guides q'and r can be arranged, either one or both of them, in the direction of the axis of rotation of the body which is balanced.v In this case also they lie perpendiciilar. to the supports m and n; so that when rocking ensues, Y there results in this case also a path approxia mating a straight line. With this manner of" construction the rear wall I; can be dispensed with and the machine is therefore more capable of employment with balancing bodies having a very great diameter. This result, however, may be. obtained with the first example-ofthe invention,

as far as the great'majority of caseswhich arisev in practice are concerned, by hollowing out the, rear wall in the middle. I

Iclaim: l 1. In a balancing machine, a base having a wall ,along one edge thereof, there being slideways formed in said base and wall, a-slide' arranged in the base-'slideway,=a rod pi-votally and siidably associated with said slide to permit meme movement of the red at any point of adjustment of the slide, spring means'inierposedbetween the baseand the end portions of. the, said rod, a pair of slides in the wall slideway, and members pivoted each of the .last mentioned slides and extending outwardly'over the rod, 9. supporting. element pivotally connected atone end to the other portion of each of said members and at its opposite end being slidably and pivotally connected to said rod,.-said members Q beingprovided with means for receiving a body to be tested.

v2. The structure of claim 1, and rollers carrled by said members. 1 I

3. In a balancing machine, a' base, a pair of members pivoted thereto and arranged to mount a body to be tested, an auxiliaryrod mounted, v on said base directly below the axis of said body for rocking movement, and a supporting lirdr articulatedly connecting each of said members with an end portion of said rod.

4. In a balancing machine, a base, a pair of spacedmembers pivoted theretoand arranged to mount a body to be tested, an auxiliary rod, abearing siidably and. rockably supportingsaid rod and adjustable axially thereof on the base, and a supporting link articulatedly connecting each of spaced members pivoted thereto and arrangedto mount a body to be tested, a rod mounted directiy below the axis of said body on said base I for oscillation thereon, ,and 'an articulated connection between each of said members and the rod. i.

6. In e. balancing machine, a base, pivoted eiembers'mounted on said base for supporting a spaced apart pivoted members adapted to support the opposite ends ofa body to be balanced,

body to be tested, a rod carried by said base, said rod being rockably mounted on a idabie bearing member mounted on the base, s pporting linlr' members connecting the pivoted members and the ends of the rod,'and springs connected at the ends of'the said rod to said base.

7. In a balancing machine, a base, a pair of members pivoted on said base and spaced apart for supporting therebetween the opposite ends of a body to be balanced, an auxiliary rod, supporting links articulatedly connecting said rod with each of said members, and a rod bearing member on said base displaceable longitudinally along said rod and base providing a pivoting axis therefor whereby the body may swing around any de-' sired axis dependent upon displacement of said bearing.

8. In a balancing machine, a base, a pair of an auxiliary rod disposed in spaced relation to said members and-with its major axis substam tially parallel'to the major axis of the body to be balanced, a supporting link between each said member and an end portion of said rod, said supporting link members having an articulated connection respectivelywith each said pivoted member and, the rod, and a rod iulcrum bearing member adjustable on said base longitudinally or said rod, said fulcrumed bearing member having a bearing pivotally and slidablyconnected with said rod whereby to provide an adjustable axis of rotation therefor to determine the axis of'rotation of the body to be balanced. I

CARL OHLY. 

